Just Got one Saturday! First Diesel. This thing is amazing. So is this site. I did a lot of studying before going in to shop. Got a great deal on it, it being a 305 HO. First tank still above 3/4 and gauge reads 15. 5 mpg. So much for 600's. Wouldn't trade it for one right now, even after having them side by side running and driving. Can tell no difference in noise or performance.